On Apr 18, 2005, at 8:48 PM, Michael Carland wrote:
On Apr 16, 2005, at 3:50 PM, Michael Carland wrote:With both XvMC’s enabled (or just the VIA one), and deinterlace Bob (2x framerate), the picture looks great, but there are bursts of “prebuffering pause”s and “WriteAudio: buffer underrun” messages that go along with stuttering video.
With both XvMC’s disabled, no deinterlace, there are no pauses, no bad log messages, but there is video tearing.
With both XvMC’s disabled, and bob deinterlace, video is shown twice, split screen, with same picture squished on the top and the bottom, colors are funny (lots of purples and blues), and the whole screen flickers solid green. It’s a little noticable.
I'm still having no luck with this, although I may be wrong that it works fine when it is not live tv, it just works much better.
I have put a "-v all" log (it's about 1MB) at http://webpages.charter.net/mcarland/mythfrontend.livetv of startup and watching live tv for a short time. From the log, it appears XV and XvMC are being used. I've also done an strace, and see it opening the XvMC library, since the log complains about not finding the nVidia XvMC library. I count 1 buffer underrun and 32 prebuffering pauses in a 28 second period.
I've bumped down the bitrate to 3500, and that didn't seem to help.
I've tried two different backends, with the same results, and is the same in .17 and .18. I did a copy over NFS from the backend to the frontend, and saw acceptable throughput. I can't remember exactly how fast it was, but it was better than 4MB/sec over a 100Mb link.
Any suggestions on how to narrow this down further?
For the record, this is solved. I am using the ivtv driver, and VBI support is still being worked on. I knew this, but thought since I wasn't turning on CC, it wouldn't affect me. Wrong.
Turning off VBI in myth setup resolved all but the most minor bits of video stuttering.
-Michael
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